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2002 20hp. 48" cut M# U609H . twin cyl. B&S. Turns over but no start ! Only one cyl. firing! Ran great aweek ago! Plug gunked up on one cyl., but other plug good tan color

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Should actually run on one cylinder,but noticeably rough and lack power.
anyway Remove plug from fouled cylinder clean it or replace it next put plug in spark plug boot and ground it near the cylinder against metal ,get on mower and attempt to start as normal and watch the plug for spark? yes ? put plug back in and torque to 18 ft.lbs and gap at .030. if no spark you may have a bad ignition coil for that cylinder or a blown cylinder piston connecting rod or piston ring issue.Find a compression gauge and insert it in that cylinder and turn engine over as if you were trying to start it and watch the gauge, and to determine what reading you should have check the known good cylinder first,if you dont have a gauge put your finger over the sparkplug hole on the supposed bad or fouling cylinder and have someone crank the engine over,you should feel air coming out on compression stroke pushing against your finger and with a small flashlight look into the sparkplug hole to see if the piston is moving back and forth in that cylinder
try to use common sense with this procedure so no one gets hurt !!!

Posted on May 09, 2010


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